The Tachikawa T-99 is a crowquill mapping nib with little flexibility and a super-fine point. Produces strong, crisp fine lines. Great for detailed drawings, and is capable of excellent line variation for pointed pen scripts such as Copperplate and Spencerian. This nib is ideal for intermediate or advanced level calligraphers and is not recommended for beginners.
This nib will only fit in crowquill holders:
Mitchell #51 Crowquill and Small Nib Holder
Hunt Crowquill Holder